Can someone with the Samyang 12mm T2.2 confirm if it will vignette with a 55mm filter on a BMPCC?

Hello All! I just wanted to upload a video I shot with the Samyang 12mm T2.2 Cinema lens while in Las Vegas for NAB. Unfortunately I had lousy luck with this lens. In Fact, it took 4 copies to get a useable lens due to extremely stiff focusing barrels, to make matters worse, the 4th copy was by far the softest of the four. I didn't feel like going through the process of re-packaging the lens and driving to UPS AGAIN!! Anyways below is the video link. I didn't use a tripod, all handheld or simply setting the camera on the ground, walls, mailboxes, etc... It was shot on a gh4, and a couple shots were g6. This upload is only the 1080 version. Thanks for watching:-)

I'm considering picking up either the cine or standard version of this lens, it would primarily be used for photography with some video shooting so I'm leaning towards the photo version because it is a little less bulky without the lens gears and I rarely use a follow focus when shooting video anyways.
Can anyone who has the photo version comment on the smoothness of the focus ring? I've read mixed reviews ranging from it being stiff to smooth.

Thanks, even the cine Rokinons that I've used have had inaccurate marks and I've had to re-chart them so I was almost expecting that.
I already have a set of Nikkors that I'm very happy with, just looking for a prime to complement them on the wide end.

The lens provides excellent sharpness at the center. At f/2 the result is already excellent.

http://www.mirrorlessons.com/2016/08/26/samyang-rokinon-12mm-f2-review/

Review

Rokinon RK12M-MFT-SIL 12mm F2.0 Ultra Wide Angle Lens for Olympus/Panasonic, $284 deal

https://www.amazon.com/Rokinon-RK12M-FX-SIL-Fujifilm-X-Mount-Cameras/dp/B00K3T3IYS/

Rokinon 12mm F/2.0 Ultra Wide, m43, $274

https://www.adorama.com/rkrk12mmftsl.html

https://www.theweekendlens.com/samyang-12-f2.html